1992 Buick LeSabre Custom 3800 V6. My Daughters Buick chugs and will even die on her. I just put new plugs in and that didn't help any. So i poured a bottle of injector cleaner in the tank and drove the car for about 5 miles and that seemed to help some. What would you suggest I try to do next? What else should I be looking at? Thanks for your help.
Answer: What you are describing could be several things, but a common problem is that the fuel pressure regulator is leaking fuel into the vacuum hose, causing a rich condition. Another symptom is that it cranks long until it starts, then runs rough for a few seconds, then clears up, may die at stops. I would also check fuel pressure, and check to see if it is misfiring.
1- Location of fuel pressure regulator on 3.8 engine